Physically Consistent Modelling of Wireless Links With Reconfigurable Intelligent Surfaces Using Multiport Network Analysis

Josef A. Nossek, Dominik Semmler, Michael Joham, Wolfgang Utschick

Research output: Contribution to journalArticlepeer-review

Abstract

Reconfigurable intelligent surfaces (RISs) are an emerging technology for engineering the channels of future wireless communication systems. The vast majority of research publications on RIS are focussing on system-level optimization and are based on very simplistic models ignoring basic physical laws. There are only a few publications with a focus on physical modeling. Nevertheless, the widely employed model is still inconsistent with basic physical laws. We will show that even with a very simple abstract model based on isotropic radiators, ignoring any mismatch, mutual coupling, and losses, each RIS element cannot be modeled to simply reflect the incident signal by manipulating its phase only and letting the amplitude unchanged. We will demonstrate the inconsistencies with the aid of very simple toy examples, even with only one or two RIS elements. Based on impedance parameters, the problems associated with scattering parameters can be identified enabling a correct interpretation of the derived solutions.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Wireless Communications Letters
DOIs
StateAccepted/In press - 2024

Keywords

  • Antennas
  • Direct Channel
  • Impedance
  • Impedance
  • Multiport
  • Reconfigurable intelligent surfaces
  • Scattering
  • Scattering
  • Scattering parameters
  • Voltage
  • Wireless communication

Fingerprint

Dive into the research topics of 'Physically Consistent Modelling of Wireless Links With Reconfigurable Intelligent Surfaces Using Multiport Network Analysis'. Together they form a unique fingerprint.

Cite this